Your Students Will Listen for Hours. Make Sure They Hear Your Voice, Not Your Room.Online Course Audio Cleaner
Upload your lesson narration, screencast voiceover, or webinar recording and let AI strip away background noise, room echo, and fan hum — no audio engineering skills required. Whether you teach on Udemy, Teachable, Skillshare, Thinkific, or your own platform, your students deserve audio that does not tire them out after the first module. Supports MP3, WAV, M4A, FLAC, and OGG up to 500 MB.
Upload a real lesson recording, not a test tone. The AI adapts to the actual noise in your recording environment.
Built for course narration
Tuned for the steady background noise that builds up during long recording sessions in home offices and spare rooms.
Consistent quality across lessons
Every lesson gets the same cleanup treatment, so students hear a consistent audio quality from Module 1 through Module 40.
Preview before you publish
Compare the original and cleaned version side by side. Download only when you are satisfied with the result.
Quick answer
Denoisr is an online course audio cleaner that removes background noise, room echo, and fan hum from lesson recordings and course narration. Upload a lecture, screencast voiceover, or webinar recording and get a cleaner version ready for your course platform. The AI adapts to your specific recording environment — whether you have an AC unit running in your home office, a laptop fan spinning during screen recordings, or that subtle room echo you cannot seem to get rid of without acoustic panels. It does not replace a full audio production workflow, but it handles the part most course creators struggle with: getting raw narration to a professional baseline before you pair it with slides, screencasts, or captions. Your students listen for hours at a time — even subtle noise causes listening fatigue that leads to drop-offs and refund requests.
Clean your course audio right here
Upload a lesson recording, lecture file, or screencast voiceover. The AI analyzes the noise profile in your specific recording — no setup required.
Works best with spoken-word recordings: course narration, lecture audio, screencast voiceovers, and webinar recordings.
Drop your lesson audio here
Start with a lecture recording, screencast voiceover, or webinar export. Files from OBS, Camtasia, Loom, Zoom, and any recording tool are supported.
Sign up free — 5 credits included, no card required.
One file at a time
Upgrade to Starter for 2-file batches
Honest expectations
What course audio cleanup handles — and where it has limits
AI denoising works well for the steady, predictable noise that accumulates during long recording sessions. But no tool fixes everything, and knowing the limits helps you get better results.
Works well for
- Home office fan noise that builds up over a 2-hour narration session
- Laptop fan spinning during screen recording with OBS or Camtasia
- AC and HVAC hum from recording in a home office or spare bedroom
- Slight room echo from narrating at a desk without acoustic treatment
- Electrical buzz and ground-loop hum from USB microphones
- Low-level ambient noise from an apartment or shared living space
May not fully fix
- Baby crying or kids playing in the next room during recording
- Construction noise or loud machinery outside your window
- Mic bumps and handling noise from adjusting your microphone mid-lesson
- Heavy room reverb from recording in a large, untreated room
- Severe clipping from gain set too high on a USB mic
- Music or video playing in the background at a noticeable volume
How it works
How to clean course audio before uploading to your platform
No audio engineering skills required. Three steps from raw narration to platform-ready lesson audio.
Upload your lesson recording
Drag and drop the raw narration file from your recording software — OBS, Camtasia, Audacity, Loom, QuickTime, or a standalone recorder. Screencast voiceovers, lecture recordings, and webinar exports all work.
Choose a cleanup mode
Select Clean Noise for a light touch that removes background hum, Enhance Voice for full loudness balancing and vocal polish, or Podcast Ready to also strip filler words and trim long silences.
Compare, download, and publish
Play the original and cleaned version side by side. Download the cleaned file and drop it into your video editor, or upload it directly to Udemy, Teachable, Skillshare, or your LMS.
Course creator scenarios
Six ways course creators use Denoisr in their workflow
Whether you are building your first course or managing a catalog of hundreds of lessons, these are the situations where Denoisr saves you time and keeps your audio consistent.
Udemy course production
Udemy reviews audio quality during the course approval process. Clean your narration before uploading so your course passes quality review on the first submission — no rework, no delays.
Teachable lesson recording
You recorded 15 lessons at your desk over a weekend. The AC was running, the laptop fan was spinning, and there is a low hum you did not notice until playback. Upload each file and clean them to a consistent baseline.
Skillshare class audio
Skillshare students can preview your class before enrolling. If the first 30 seconds has audible fan noise, they move on. Clean your intro and lesson audio so the preview sells your content, not your room noise.
Self-hosted LMS content
Running your course on Thinkific, Kajabi, WordPress with LearnDash, or a custom platform? Clean audio builds credibility with students who are paying you directly — there is no marketplace brand to lean on.
Webinar-to-course repurposing
You ran a live webinar with great content but imperfect audio. Clean the recording, split it into modules, and turn a one-time event into an evergreen course product.
Corporate training modules
Internal training content recorded by subject-matter experts who are not audio professionals. Clean their recordings so employees get clear, fatigue-free audio during mandatory training sessions.
Why course creators choose Denoisr
Professional lesson audio without learning audio engineering
Course creators are experts in their subject — not in noise gates, spectral editing, or EQ curves. Denoisr handles the technical cleanup so you can focus on teaching.
Long file support
Pro plan handles files up to 4 hours long. Record a full lecture or narrate an entire module in one session and clean it without splitting the file.
Batch processing for full courses
Upload multiple lesson files at once and let them process in parallel. Clean an entire course section or a full catalog update without babysitting each file.
Consistent quality across lessons
The AI applies the same cleanup standard to every file. Students hear a uniform audio quality from Lesson 1 through Lesson 40, even if you recorded on different days or in slightly different conditions.
Clean before adding slides or captions
Run your narration through Denoisr before syncing it with your screencast or slide deck. This way the noise is gone before it gets baked into your final video export.
No learning curve
You do not need to learn what a spectral gate is or how to configure a noise floor. Upload, pick a mode, and download. That is the entire workflow — your time is better spent on your curriculum.
Preserves your teaching voice
Over-processed audio sounds robotic and unnatural — exactly what you do not want when students are listening for hours. Denoisr reduces noise while keeping the warmth and personality of your voice intact.
Hear the difference
Before and after — real course narration recordings
These samples come from actual lesson recordings with common home-office noise. Toggle between the original and cleaned version to hear what Denoisr does.
Home office narration
Course narration recorded at home — fridge hum from the kitchen, fan, light traffic outside. The home-recording reality of online instructors.
Why creators choose Denoisr
These are the kind of recordings creators actually upload. Hear how Denoisr handles them before you try your own file.
Voice-trained AI
Keeps speech natural while suppressing steady background noise.
One-pass cleanup
No plugins, no DAW, no manual noise-profile selection.
Compare before you commit
Preview the cleaned result alongside the original — download only what sounds right.
Denoisr facts for course creators
Online Course Audio Cleaner — frequently asked questions
Can I clean a 2-hour lesson recording?+
Yes. The Pro plan supports files up to 4 hours long, so a 2-hour lecture or narration session is well within limits. The file processes as a single unit — you do not need to split it into shorter segments. Processing time scales with file length, so a 2-hour file will take longer than a 10-minute lesson, but the result is one cleaned file ready to use.
Does it work for screen recording narration?+
It does. Screen recording narration is one of the most common files course creators upload. Whether you record your voiceover in OBS, Camtasia, Loom, or QuickTime, just export the audio track (or upload the video file directly) and the AI will clean the background noise. Laptop fan noise during screen recording is especially common and responds well to cleanup.
Will course platforms notice cleaned audio?+
Course platforms like Udemy, Teachable, and Skillshare evaluate audio quality during their review process, and cleaned audio consistently passes where noisy originals get flagged. The cleanup sounds natural — it is not adding artificial effects, just removing unwanted noise. Reviewers and students hear cleaner narration, not processed or robotic audio.
How do I maintain consistent quality across 20 lessons?+
Upload all your lesson files and process them with the same cleanup mode. The AI applies the same noise reduction approach to each file, producing a consistent output level and clarity across your entire course. If you recorded some lessons in different conditions, the AI adapts to each file's noise profile individually while still targeting the same quality baseline. Batch processing makes this practical — you do not need to clean one file at a time.
Should I clean audio before or after adding slides?+
Before. Clean your narration audio first, then sync it with your slides, screencast, or video footage. If you clean after combining audio and video, the noise is already baked into the final export, and some video editors re-encode the audio in ways that make cleanup less effective. The workflow is: record narration, clean with Denoisr, then combine with visuals in your video editor.
Your students will thank you for cleaner audio
Upload a lesson recording, screencast voiceover, or lecture file and hear the difference in minutes. Five free credits included — no credit card, no commitment.